@unpublished{Laeuter2011,
  author  = {Henning L{\"a}uter},
  title   = {On approximate likelihood in survival models},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Mathematische Statistik und Wahrscheinlichkeitstheorie : Preprint},
  number    = {2006, 04},
  year    = {2011},
}